It is currently 19 Nov 2017, 05:43

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Problems with Work/Rate questions

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Intern
Intern
avatar
Joined: 29 Dec 2010
Posts: 33

Kudos [?]: 5 [0], given: 3

Problems with Work/Rate questions [#permalink]

Show Tags

New post 07 Apr 2011, 10:36
Hi guys, I’m having tremendous problems studying for rate and work questions... I’ve been studying for around 8 months... and have been able to spin around these questions but know I need to absolutely know them..
I have read the rate/Work section in the MGMAT words translations,, but It only helped me on rates.. speed etc... cars moving towards and away... but in work questions I am a mess. Im doing rate and work questions here on the gmatclub.com forums.... the rate questions I know im getting the jist of them... but I can hardly do any work questions.... I am in serious trouble on this... I cant afford to get a very simple work problem in the first 1-10 question ...

Can anyone recommend me a way to study the work questions?? apart from the words trnslations.. it only covers very little the work problems..

regards

Kudos [?]: 5 [0], given: 3

Manager
Manager
avatar
Joined: 18 Jan 2011
Posts: 228

Kudos [?]: 37 [0], given: 4

Re: Problems with Work/Rate questions [#permalink]

Show Tags

New post 09 Apr 2011, 15:59
1) Use unitary method for simple problems
e.g If A can complete a unit of work in 10 days, how many days can A do two units of work working at half the efficiency?
1 unit in 10 days
2 units in x days
i.e. x = 20
with full efficiency - 20 days
with 1/2 efficiency - y days
so logically, it should be double the time i.e. 40 days

2) Slightly complex problems - use
(1/x + 1/y = 1/Time) Below example explains how this formula can be derived.

e.g. If A can do something in 3 hours and B can do the same in 2, how long would it take them while working together?
A can do 1 unit in 3 hours
A can do x units in 1 hours
So x = 1/3

Similarly, B can do 1 unit in 2 hours
B can do y units in 1 hours
So y = 1/2

In one hour, total work = work done by A + work done by B
i.e. 1/3 + 1/2
=> 5/6

Again, unitary method
5/6th work can be done in 1 hour
1 work (i.e. full) can be done in x hours
i.e. x = 6/5

Instead of using this method, just plug in the values in the formula.
_________________

Good Luck!!!

***Help and be helped!!!****

Kudos [?]: 37 [0], given: 4

GMAT Forum Moderator
avatar
Status: Accepting donations for the mohater MBA debt repayment fund
Joined: 05 Feb 2008
Posts: 1882

Kudos [?]: 923 [0], given: 234

Location: United States
Concentration: Operations, Finance
Schools: Ross '14 (M)
GMAT 2: 710 Q48 V38
GPA: 3.54
WE: Accounting (Manufacturing)
GMAT ToolKit User Premium Member Reviews Badge
Re: Problems with Work/Rate questions [#permalink]

Show Tags

New post 09 Apr 2011, 20:33
You should practice word translations and word problems. Practice moving from words to equations and from equations to words.

MGMAT and Veritas both have a book on this subject.

MGMAT:
http://www.amazon.com/Word-Translations ... =8-1-spell
MGMAT ebook:
http://www.amazon.com/Translations-Prep ... =8-2-spell

Veritas:
http://www.veritasprep.com/gmat-prep-books/
(the individual Veritas book is not available on Amazon)
_________________

Strategy Discussion Thread | Strategy Master | GMAT Debrief| Please discuss strategies in discussion thread. Master thread will be updated accordingly. | GC Member Write Ups

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 923 [0], given: 234

Re: Problems with Work/Rate questions   [#permalink] 09 Apr 2011, 20:33
Display posts from previous: Sort by

Problems with Work/Rate questions

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderator: HKD1710

HOT DEALS FOR NOVEMBER
Economist GMAT - Free Free 1-week trial + Free Test
Kaplan Courses - Save $475 $225 Discount + $250 Bonus
Target Test Prep - $800 $50 Discount + $750 Bonus [GMAT Club
Tests and Premium MBA Bundle]
EMPOWERgmat - $99/mo GMAT Club tests included 2nd month
GMAT Club Tests - Free Included with every course purchase
of $149 or more - Full List is here


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.